Marit Lage's Imprisonment

Enchant target land an opponent controls
At the beginning of each upkeep, put an
awakening counter on enchanted land. Then, if
there are 10 or more awakening counters on enchanted land, remove them all and create a
20/20 blue Horror creature token with flying
and indestructible
"Great, now there's this guy to deal with"
—Master Cahn